This....is an interesting take that I wouldn't have thought of otherwise, thank you.
You're right, Light Yagami is blinded. Confused. The world isn't as he sees it, himself isn't as he sees it. He's overidentified too much with what he's trying to enforce, to the point where he's stopped looking at himself to see where he stands. Any impeding hint of guilt is immediately disregarded, as he believes it'll only distract him, despite that voice in the back of his head trying to save him, something he only realizes as he bleeds to death in that staircase.
Beautiful point. Obsessive compulsive tendencies do be the end to many a great minds.
Overall, Light wanted to do some good, and it's obvious from seeing the anime that he's always been obsessed with the idea of fairness, and he saw the Death Note as his only way to enforce authority, a system of rules that he thinks will help everyone, and sacrifices every ounce of human in him to be a God. And that was his problem. When you lose touch with what's human to become something more, you inadvertently risk becoming something much less, and the confusion between these two is what ends up causing their demise.
Light, as a person, is everything that I don't want to become; a person so obsessed over one thing that he tunnel visions deeper and deeper without ever getting any better. He is worth feeling sorry for. One of the only reasons I put Mello and Light up in my most favorite characters from Death Note is for practically the same reason; they're both obsessive compulsive, which means they'd stop at literally nothing to have their ends of the bargain met. These are people you do NOT want to screw with, because it only takes them something like the Death Note (for Light) and the existence of someone better (for Mello) for them to go batshit crazy on whoever tries to stop them.